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A ball is thrown from the top of a tower with an initial velocity of 10 m s-1 at an angle ot 30° with the horizontal. If it hits the ground at a distance of 17.3 m from the base of the tower, the height of the tower is (Take g = 10 m s-2)
  • a)
    5 m
  • b)
    20 m
  • c)
    15 m
  • d)
    10 m
Correct answer is option 'D'. Can you explain this answer?
Most Upvoted Answer
A ball is thrown from the top of a tower with an initial velocity of 1...
The ball is thrown at an angle, θ = 30o.
Initial velocity of the ball, u = 10 m/s 
Horizontal range of the ball, R = 17.3 m
We know that, R = u cosθ t,
 where t is the time of flight 

using equation of motion we get:-

⟹ Height of tower, h = 10 m
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Community Answer
A ball is thrown from the top of a tower with an initial velocity of 1...
° above the horizontal. The tower is 50 meters tall. Calculate:

a) The time it takes for the ball to hit the ground.
b) The horizontal and vertical components of the ball's velocity just before it hits the ground.
c) The total distance the ball travels before hitting the ground.

a) To solve for the time it takes for the ball to hit the ground, we can use the formula:

h = ut + 0.5at^2

Where h is the initial height of the ball (50 meters), u is the initial velocity (10 m/s), a is the acceleration due to gravity (-9.81 m/s^2), and t is the time it takes for the ball to hit the ground (unknown).

Substituting the given values, we get:

50 = 10t + 0.5(-9.81)t^2

Rearranging and simplifying:

4.905t^2 + 10t - 50 = 0

Using the quadratic formula:

t = (-b ± sqrt(b^2 - 4ac))/2a

Where a = 4.905, b = 10, and c = -50.

Solving for t, we get:

t = 3.84 seconds (rounded to two decimal places)

Therefore, it takes the ball approximately 3.84 seconds to hit the ground.

b) To solve for the horizontal and vertical components of the ball's velocity just before it hits the ground, we can use the following equations:

v = u + at
v^2 = u^2 + 2as

Where v is the final velocity, u is the initial velocity, a is the acceleration, and s is the displacement.

The vertical component of the ball's velocity just before it hits the ground can be found using the first equation, where a is the acceleration due to gravity:

v_vertical = u_vertical + at

Where u_vertical is the initial vertical component of the velocity, which is:

u_vertical = u*sin(30°) = 5 m/s

Substituting the given values, we get:

v_vertical = 5 + (-9.81)*3.84

v_vertical = -32.78 m/s (rounded to two decimal places)

The negative sign indicates that the ball is moving downwards.

The horizontal component of the ball's velocity remains constant throughout its flight, since there is no horizontal acceleration. Therefore, the horizontal component of the velocity just before it hits the ground is:

v_horizontal = u_horizontal = u*cos(30°) = 8.66 m/s

c) To solve for the total distance the ball travels before hitting the ground, we can use the following equation:

s = ut + 0.5at^2

We can solve for the horizontal and vertical components of the displacement separately, since they are perpendicular to each other.

The horizontal component of the displacement is:

s_horizontal = u_horizontal*t = 8.66*3.84 = 33.26 m

The vertical component of the displacement is:

s_vertical = u_vertical*t + 0.5at^2 = 5*3.84 + 0.5*(-9.81)*3.84^2 = -59.53 m

The negative sign indicates that the ball is moving downwards.

The total distance the ball travels before hitting the ground is the magnitude of its displacement,
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A ball is thrown from the top of a tower with an initial velocity of 10 m s-1 at an angle ot 30° with the horizontal. If it hits the ground at a distance of 17.3 m from the base of the tower, the height of the tower is (Take g = 10 m s-2)a)5 mb)20 mc)15 md)10 mCorrect answer is option 'D'. Can you explain this answer? for NEET 2025 is part of NEET preparation. The Question and answers have been prepared according to the NEET exam syllabus. Information about A ball is thrown from the top of a tower with an initial velocity of 10 m s-1 at an angle ot 30° with the horizontal. If it hits the ground at a distance of 17.3 m from the base of the tower, the height of the tower is (Take g = 10 m s-2)a)5 mb)20 mc)15 md)10 mCorrect answer is option 'D'. Can you explain this answer? covers all topics & solutions for NEET 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for A ball is thrown from the top of a tower with an initial velocity of 10 m s-1 at an angle ot 30° with the horizontal. If it hits the ground at a distance of 17.3 m from the base of the tower, the height of the tower is (Take g = 10 m s-2)a)5 mb)20 mc)15 md)10 mCorrect answer is option 'D'. Can you explain this answer?.
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